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National Transportation Safety Board (NTSB) Chair Deborah Hersman, right, accompanied by John DeLisi, director of NTSB Office of Aviation Safety, speaks during a news conference in Washington, Thursday, Feb. 7, 2013, to provide an update on the NTSB's investigation into the Jan. 7 fire that occurred on a Japan Airlines Boeing 787 at Logan International Airport in Boston. (AP Photo/Ann Heisenfelt)

National Transportation Safety Board (NTSB) Chair Deborah Hersman, right, accompanied by John DeLisi, director of NTSB Office of Aviation Safety, speaks during a news conference in Washington, Thursday, Feb. 7, 2013, to provide an update on the NTSB's investigation into the Jan. 7 fire that occurred on a Japan Airlines Boeing 787 at Logan International Airport in Boston. (AP Photo/Ann Heisenfelt)